How Can I Avoid Code Duplication When Initializing Readonly Fields in Multiple Constructors?

Call another constructor within a constructor

In a class, the constructor is used to initialize fields when the object is created. In some cases, multiple constructors may provide values ​​to read-only fields. Consider the following class:

public class Sample
{
    public Sample(string theIntAsString)
    {
        int i = int.Parse(theIntAsString);
        _intField = i;
    }

    public Sample(int theInt) => _intField = theInt;
    public int IntProperty => _intField;

    private readonly int _intField;
}

There are two constructors here. However, the problem arises when you want to avoid duplicating field setup code, since read-only fields need to be initialized in the constructor.

Fortunately, there is a solution: use constructor chaining. By adding the following line in the string argument constructor:

public Sample(string str) : this(int.Parse(str)) { }

You can call the integer parameter constructor from the string parameter constructor. This delegates field initialization to existing code, eliminating the need for duplication.

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